Machine type communication (MTC) configuration, interference management, and retuning time for uplink transmissions

A method for wireless communications by a base station (BS), comprising:

• identifying at least one narrowband region within a wider system bandwidth;
• signaling, to a user equipment (UE), an indication of a sub-region of the narrowband region assigned to the UE for transmitting symbols of a physical uplink channel that are multiplexed with symbols transmitted by one or more other UEs in the narrowband region, wherein the signaling comprises a resource offset into the narrowband region, wherein different resource offsets into the narrowband region define different sub-regions of the narrowband region, and wherein different resource offsets into the narrowband region are assigned to UEs with coverage enhancement and UEs without coverage enhancement;
• signaling a resource index within the sub-region of the narrowband region;
• identifying, based on a mapping of the resource index to cyclic shifts, an initial cyclic shift associated with the resource index for transmitting symbols of the physical uplink channel in the assigned sub-region;
• and
• receiving the physical uplink channel in the assigned sub-region based on the resource index, the identified initial cyclic shift, and a shift hopping function.

A method for wireless communications by a user equipment (UE), comprising:

• identifying at least one narrowband region within a wider system bandwidth;
• receiving signaling, from a base station, indicating a sub-region of the narrowband region assigned to the UE for receiving symbols of at least one physical downlink channel that are multiplexed with symbols transmitted by one or more other UEs in the narrowband region, wherein the signaling comprises a resource offset into the narrowband region, wherein different resource offsets into the narrowband region define different sub-regions of the narrowband region, and wherein different resource offsets into the narrowband region are assigned to UEs with coverage enhancement and UEs without coverage enhancement;
• determining, based on a mapping of values of a resource index to spreading codes, an spreading code for receiving symbols of the physical downlink channel in the assigned sub- region;
• and
• receiving the physical downlink channel in the assigned sub-region, wherein receiving the physical downlink channel comprises applying the spreading code when receiving symbols of the physical downlink channel in the assigned sub-region.

A method for wireless communications by a base station (BS), comprising:

• identifying at least one narrowband region within a wider system bandwidth;
• signaling, to a user equipment (UE), an indication of a sub-region of the narrowband region assigned to the UE for receiving symbols of a physical downlink channel that are multiplexed with symbols transmitted by one or more other UEs in the narrowband region, wherein the signaling comprises a resource offset into the narrowband region, wherein different resource offsets into the narrowband region define different sub-regions of the narrowband region, and wherein different resource offsets into the narrowband region are assigned to UEs with coverage enhancement and UEs without coverage enhancement;
• determining, based on a mapping of values of a resource index to spreading codes, a spreading code for receiving symbols of the physical downlink channel in the assigned sub- region;
• and
• transmitting the physical downlink channel in the assigned sub-region, wherein transmitting the physical downlink channel comprises applying the spreading code when transmitting symbols of the physical downlink channel in the assigned sub-region.